Grinding machine



Nov.'26, 1929. w. F. FRASER GRINDING MACHINE Filed June 14, 1923 12 Sheets-Sheet l I77/v671/50r" Nov. 25, 1929.

w. F.. FRASER 1,736,967

GRINDING MACHINE Filed June 14, 1923 12 Sheets-sheaf. 2

Nov.'2 6, 1929. w. F. FRASER 1,736,967

GRINDING MACHINE Nov. 26, 1929;

W. F. FRASER GRINDING MACHINE Filed June 14, 1923 12 Sheets-Sheet 4 a4 /&

5 ll) H "Lil LI.

Y i I flz 1/ v W 7 I l l [7 ave 77/2907":

Nov. 26, l929. w. F. FRASER GRINDING MAGHINE Filed June 14,

1923 12 sheets-sheet 6 Nov. 26, 1929. w. F. FRASER GRINDING MACHINE Filed June 14. 1923 12 Sheets-Sheet 9 I7Lve71/to7":

w. F. FRASER 1,736,967.

GRINDING MACHINE Filed June 2 12 Sheets-Sheet 1o M III mm m M w I. m fi J l/flfi Q i v4 U 1 w P Nov. 26, 1929.

Nov. 26, 1929. w. F. FRASER GRINDING MACHINE Filed June 14, 1923 12 Sheets-Sheet ll 1 7 Uu e 721/0 7":

Fatented Nov. 26, 1929 PATENT oFFlca WABREN F. FRASER, OF WESTIBOBO, MASSACHUSETTS GRINDING MACHINE Application filed June 14,

This invention relates to improvements in grinding machines. y

The object of the invention is to provide a machine particularly adapted for rapidly and accurately grinding large quantities of similarly shaped blanks, said blanks being automatically fed into the machine and accurately I positioned and ground to the desired shape and dimensions of the finished article, after which they are automatically released and dropped into a suitable receptacle.

In the machine of this invention the blanks to be ground are preferably placed one above the other in a magazine from which said blanks are taken one at a time and carried forward between the centers of a head-stock I and a tail-stock. The blank so carried is then pushed by the tail-stock center into a chuck or other suitable'positioning or holding device on the head-stock. rotary motion is imparted to the chuck and tail-stock indle, both of which are rotated in unison t ereby rotating the blank held therebet-ween. The grinding wheel rotating at a rapid speed and 2 reciprocating in a direction longitudinally of its axis is then'moved into. engagement with the blank, the said grinding wheel approaching said blank in a curvilinear path, which, at the point of contact of the grinding wheel and blank, is approximately tangential to the periphery of said blank. The grinding wheel approaches the blank quickly until it engages the same, after which it is fed slowly during the actual grinding operation'until it arrives at the limit of its forward feeding movement where it dwells for a suflicient period for the work to be ground to a fine and accurate finish, after which said grinding wheel retreats quickly. The grip of the chuck upon the work is then released and the tail-stock center is withdrawn, thereby permitting the finished article to drop into a suitable .receptacle located therebeneath. Another blank is 5 then fed to the grinding instrumentalities and the operation hereinbefore set forth is repeated.

It will be understood that all of the difierent operations hereinbefore set forth are automatic in their action. The machine is also 1 23. Serial No. 645,318.

provided with the usual apparatus for directk ing water upon the work during the grindin thereof to keep the same cool, together witE an apparatus for maintaining a continuous flow of lubricating oil to certain of the bearings.

The invention consists in the combination and arrangement of parts whereby the above objects and certain other objects hereinafter appearing may be attained as set forth in the following specification and particularly pointed out in the claims thereof.

Referring to the drawings:

Figure 1 is a front elevation of a grinding machine embodying the invention, certain portions thereof being broken away and illustrated in section.

Fig. 2 is a plan view of the machine, certain portions of which are broken away to more clearly illustrate mechanism located therebeneath.

Fig. 3 is an end elevation of the machine as viewed from the right of Fig. 1, the front of the housing for the tail-stock driving mechanism being removed in order to more clearly illustrate said driving mechanism.

Fig. 4 is a central horizontal longitudinal section through the head-stock mechanism.

Fig. 5 is a central horizontal longitudinal section through the tail-stock mechanism.

Fig. 6 is a detail longitudinal section illus-- trating the floating driving connection to the tail-stock spindle.

Fig. 7 is a sectional elevation illustrating the mechanism for operatively connectin the cam shaft with the work driving shaft to drive the former from the latter.

Fig. 8 is a vertical transverse section taken on the line 8-8 of Fig. 7.

Fig. 9 is a sectional elevation illustratin the cam shaft together with the cams mounte thereon, together with the mechanism for connecting the head-stock cam and the tailstock cam to the mechanism operated thereby.

Fig. 10 is an end elevationas viewed from the right of Fig. 9 illustrating the tail-stock operating mechanism and a portion of the mechanism for moving the grinding wheel into engagement with the work.

11 is a transverse section taken on the line 11-11 of Fig. 9 illustrating the mechanism for operating the head-stock chuck.

Fig. 12 is a detail transverse section taken on the line 12-12 of Fig. 2 illustrating a portion of the tail-stock operating mechanism.

Fig. 13 is a sectional elevation taken approximately on the line 1313 of Fig. 2 and illustrating the work feeding mechanism.

- Fig. 14 1s a plan view illustrating the ad- Fig. 16 is a plan new of 'thegrinding 5.11--

strumentalities, certain portions thereof he-f in}; broken away and illustrated in section.

v Fig. 17 is a vertical sectional elevation taken on the line -1717 of Fig. 16.

Fig. is is a detail view of the mechanlsm as imparting the reciprocat'ory motion to the grinding wheellongitudinally of its axis.

Fig. 19 is a longitudinal section taken on the line 19-19 of. Fig. 16.

. Main mechanism In the drawings, 1 represents the frame of the machine in which'a main driv-.

in shaft 2' is journalled in suitable bearings,

' sald shaft being driven by a clutch ulleyv 3 and driving belt 4.- The clutch pu ley 3 is operated and controlled by means of a suitable operating lever 5. Fast to theidrivin'g shaft 2 is a cone pulley 6 which: is connected by a driving belt 7 to a cone pulley 8 fast to a work driving shaft 9 also journalled in suit:

able bearings provided upon the frame 1. i v

H cad stock mechanism Formed integral with the main frame 1 is a head-stock bed platelO, the face of which is preferably inclined at an angle of and mounted upon said bed plate 10 is a headstock mechanism 11. The head-stock mecha nism 11, see Fig. 4, embodies therein a head- :stock frame 12 which is mounted to slide lonthe bed plate 10 andadaptgitudinally u on p in the usual "well ed to be secured thereto known manner. A spindle 13 is journalled I to rotate in a-bearing 14 rovided in the headi stock same 12 and sai spindle has a sleevei 3' 15 keyed thereto and 'journalied to rotate in 55. The sleeve 15-has a clamp member 17 keyed thereto and the s indie 13, sleeve;- 15 and a hearinglfi alsoprovided in the frame 12.

clamp member 17 a ,therefore, rotate in unison.

Y Y bore 18 v at one xrhe spindle 13 is'provid d with time is "which extends longitudinally. therethrough upontheaxis thereof and located within said end thereof is a spring chuck. 19. The s ring chuck 19 is formed-with an enlarged rustroconical outer end 20 which is adapted to fita correspondingly shaped opening 21-atthe end of the bore 18, w ile the outer end of the chuck 19 is rovided with a recess 22 in which the wor may be inserted and a plurality of radial slots 23 which allow said chuck to ip the end of the work supported therein. pin24 fast in the spindie 13 projects into a longitudinal groove 25 provided in the chuck 19, thereby enabling the spindle and chuck to rotate in unison and also enabling the chuck and spindle to be moved longitudinally relatively. to each other...

The inner end of the chuck 19 is screw-threaded at 26 and has attached thereto a shaft 27 which. extends through the spindle 13upon the axis thereof pro ecting beyond the rear end of said spindle and having a head portion 28 formed adjacent to its outer end which may be utilized in rotatingsaidshaft 27 relative.-

ly to the chuck 19 when itis desired to adjust said chuck within the spindle I3 or entirely remove said chuck from said spindle. Keyedto' the shaft 27 is a friction member 29 and the latter is held securely clamped against the clamp member 17 through the medium of another clamp member 30 and screws 31.

Loosely mounted upon the spindle 13 is a clutch member 32 adapted to engage clutch fingers 33 pivoted ates u on a collar 35 fastened upon a shoulder portion of the spindle 13. A ring .36 is loosely mounted upon the spindle 13 being interposed between a flanged portion of the sleeve 15 and the collar 35 and said ring is provided with rounded projections 37 which project from' one face thereof and contact with the end surface of the sleeve 15 upon opposite sides ofthe spindle 13, while the ends of the clutch fingers 33 adjacent to the ring 36 are adapted to contact with the side face of the ring 36 when the clutch fingers are, locatedin thev position illustrated in Fig. 4. The clutch member 321is moved longitudinallyupon the spindle 13 to engage or release the clutch 110 disposed clutch shifting lr 'einber, 38, whic is provided with aforked lower end 39 which fingers'33 through the'medium' of a verticall.

partially surrounds said clutch member 1 and 13 operatively connected thereto.- I The clutch shiftin member 38 is mounted to rock in a suite le beariu provided in a cap 40 provided for the-hea stock frame'12, said shift 11 member being rocked through the medium E an-1 op r a. handle 42 where y thejhead-stock mechanism may be manually operated if it is sodesired- Theoperating' arm 41 has a member .43 mounted therein which may be raised through the mediumof a "finger iecefl and said -member 4.3 isfnormally I ocated within a grooved mtimber 45 whlch is adjustably secured to ajleverdtig the latter being pivoted at47upon the interior of the frame 1. The

leverfi is rockedthro'the medium of a cam 48"fast to a'cainw aft 49, see Figs. 9

-arm-g41' provided with a 27 and the various bearings 59 and 51. The lever 46 has a cam roll 52located at the lower end thereof which is always held in engagement with the periphery of the cam 48 through the medium of" a plunger 53 mounted to slide in a bearing member 54, said contact with said ever through the medium of a spring 55 located within the bearing member 54. When the clutch member 32 is moved toward the left in Fig. 4 into engagement with the clutch fingers 33 the latter are rocked a sufiicient distance to cause said fingers to engage the side face of the ring, 36 and thus cause the collar to push the spindle 13 toward the right, F1 4, and as the shaft 27 and chuck 19 are hel against longitudinal movement within said spindle, the conical end surface of the spindle 13 will engage the conical portion of the chuck 19 and cause said chuck to grip-the work wh ch has been inserted therein as will be hereinafter described.

' A rotary motion is impartedto the shaft arts which are rotated in unison therewith t rough the'medium of a sprocket 56 fast to the work driving shaft 9, said sprocket being connected throu h the medium of a chain 57 with a sproc et 58 fast to a sleeve 59 mounted to rotate 1n bearings 60 and-61 rovided in a housing 62 mounted upon the ame 1 at the left hand end thereof, see Fi 1. The sleeve 59 has a shaft 63 mounte to slide longitudinally therein and also secured thereto by akey 64 in order that said sleeve and shaft may rotate in unison, and located at one end of said shaft 63 is a coupling 65' which is secured thereto in any desirable manner. The

coupling .65 has a recess '66 formed therein into which an end 67 of the shaft 27 projects as illustrated'in Fig. 4.' The diameter; ,of the recess 66 is substantially greater than.

the diameter of the end 67 of the shaft 27 thereby enabling said shafts 63 and 27 to be connected to rotate in unison even if said shafts happen to beslightly out ofalign;

ment. The end 67 of the shaft 27 is secured' to the coupling 65 by-a suitable-key.

Tail-stock mechanism provided in the tail-stock frame 70 and fast m said spindle and rotatable inunison therewith is a centering pin 74. The longitulunger being forced into throu plate '10.

ig. 5,. which aim 'dinal median lines of the centering pin 74 and chuck 19 are coincident and said pin and chuck co-operate with each other in centering and supporting the workwhich is located therebetween. The end of the spindle 71 in which the centering pin 74 is located has screw-threaded engagement with one end oft-he bearing member 72.

dered portion of the spindle 71 between the collars 77 and 78 is a washer 79 and a shifting member 80. The collars 77 and 78, washer 79 and shifting member 80. are

projects through the frame 70- and has a. cap 7 5. fast thereto, ,a portion thereof surrounding the tubular end of a nut 76 which all prevented from moving longitudinally upon the spindle 71 by a nut 81. A shifting member 82 is mounted to rock in a suitable bearing provided in a cap 83 provided for the tail-stock-frame 70, and said shifting member is provided with a forked lower end 84 whichpartially surrounds the shifting member '80, being op'eratively connected to thelatter through'the medium of pins 85 which project intov notches 86 provided in the shifting member 80. AnToperat-ing arm 87 is fast to the shifting member 82 and said arm is provided with a handle 88 whereby the tail-stock mechanism may be manually operated if it is so desired. Fast to the operatin'g armv87 is a member 89 which projects downwardly into a grooved member-9O which is adjustably fastened to a lever 91 pivoted at 92 upon the interior of the frame 1. A

rockin lathe medium of a cam 93 fast to the cam s aft 49, said cam engaging a cam roll 94 fast to the lower end of said lever. A 'spring'95 acts to. always hold the 'cam roll 94 in, erggagement with the periphery of the cam J motion is imparted to the lever 91 A rotar motion is imparted to the 'tailstock spin le'71 and centering pin 74 through the medium of a sprocket- 96 fast to the work driving shaft 9 and at the opposite end thereof from that at which the sprocket 56 is located, said sprocket bein connected throu h the medium of a chain 97 with a,

sproc et 98 fastto a sleeve 99 mounted to rotate. in bearings 100 and101 provided in a housing 102 mounted upon the frame .1 at

the ri ht hand endthereof, see Figsal and 3.

The s eeve 99 has a shaft 103-mounted to slide longitudinally therein and also secured thereto by a key 104m order that said sleeve i and shaft may rotate in unison and located at one'end of said shaft 103 is a coupling 105 which is secured thereto in any desirable manner. The coupling 105 has a recess 106 formed therein into which an end 107 of the tail-stock spindle 71 projects as illustrated in Fig. 6. The diameter of the recess 106 is substantially' greater than the diameter at the end 107 of the spindle 71, thereby enabling the spindle 71 and shaft 103 to be connected to rotate in unison even if said spindle and shafthappen to be slightly out of alignment.

The end 107 is keyed to the coupling 105 in order that the spindle 71 and shaft 103 may rotate in unison. The shaft 103 is secured to the coupling 105 by being keyed thereto.

A chain tightening device 108 is provided for the chain 97 and embodies an idler sprocket" 109 rotatably mounted upon a lever 110 pivoted at 111 to a housing 112 provided for said chain, and said lever is clamped to said housing by a suitable screw 113.

(7am shaft driving mechanism The mechanism for driving the cam shaft 49 at a greatly reduced speed from the work driving shaft 9 and for disconnecting the former from the latter to prevent the operation of the cam shaft is"'fas*} follows:-

' Referring to Figs. 7 and *8, the work driving shaft 9 has'a spiral gear 114 fast thereto which meshes with and rotates a spiral gear 115 fast to a sleeve 116 mounted to rotate loosely upon a countershaft 117 journalled to rotate in suitable bearings provided in a casing 118, the latter being secured tothe exterior of the frame 1. A gear 119 fast to the shaft 117 meshes wit-hand rotates a gear 120 fast to a countershaft 121 journalled to rotate in bearings provided in the casing 118. Another gear 122 meshes with and rotates a gear 123 fast to a countershaft 124 also journalled to rotate in bearings provided in the casing 118. A worm 125 fast to the countershaft 124 meshes with and rotates a worm gear 126 fast to the cam shaft 49. The countershaft 124 is provided with a squared end127 to which a suitable crank may be connected thereby enabling the cam shaft to be manually operated if it is so desired.

Also fast to the sleeve 116 and rotatable therewith is a clutch member 128. Another- 7 clutch member 129 is keyed to the counter shaft 117 and is also adapted to slide longitudinally upon said shaft into and out of engagement with the clutch member-128, the

said clutch member 129 receivlng its longi- I tudinal movement from a forked arm 130,

fast to a rock shaft l31mounted in the easing 118. An arm 132 also fast to said rock shaft 131 has a connecting rod 133 attached thereto which extends to and is connected with an arm 134 fast to arockshaft 135 mounted in the frame 1 and said rock'shaft has an fast to a countershaft 121 operating handle 136 attached thereto at the front of the machine, see Fig. 1, and located in a convenient position to be manipulated by the attendant.

Work feeding mechanism brackets 139 which are adjustably secured to a cross bar 140 forming a part of the guard 141. The lowermost blank A in the magazine rests upon supports 142 which arepivoted at 143 to brackets 144 which are adjustably secured to an oscillatory frame 145. Each support 142 may be adjusted to raise or lower the upper surface thereof through the medium of a screw 146, the lower end of which engages a lug 147 formed integral with the bracket 144. After each support 142 is correctly positioned relatively to its bracket 144, said support is clamped to said bracket through the medium of a clamp screw 148. Each support 142 is provided with projections 149 upon which the blanks A rest and between said projections a latch 150 is pivoted at 151, said latch co-ope rating with its sup port 142 to form a pocket into which the blanks may fall one at a time as the supports 142 oscillate beneath the pile of blanks. The lower end of each latch 150 enga'ges'a spring pin 152 slidably mounted within. the support 142 and; after the blank A which is 19 and centering pin-7 4 the supports 142 move rearwardly, the, latches 150 yielding beneath the blank A and forcing the spring pins 152 inwardly. After the latches 150 have passed beneath the blank A; the spring pins will immediately force'the latches upwardly to again form the pockets to receive the next blank. i

\ The oscillatory frame 145 embodies therein a pair of downwardly projecting arms 153 formed integral with a hub 154 which is located within the pocket at the front of said supporthas been gripped between the chuck screw 161 acts to always pull the lower end i of the arm 157 toward the cam 159 and hold the cam roll 158' in engagement with the periphery of said cam. The tension of the spring 160 is adjusted through the medium of a nut 162 with which the screw 163 has engagement, said nut 162 being rotatably mounted in a plate 163 fast to the front of the frame 1. The amount of throw given to the frame 145 may be varied by a pin 164 which is adjustably mounted in the plate 163', said pin acting as a to stop to limit the forward move ment of the slide 142.

. Grinding mechanism The mechanism for grinding the blanks A to a finished dimension is as follows :--referring particularly to Figs. 14 to 19 inclusive, the frame 1 has a bed plate 165 formed integral therewith upon which a slide 166 is mounted,'said slide being pivoted at 167 to rock in a horizontal plane upon the upper surface of said bed plate to which it is clamped by a plurality of screws 168, said screws passing through suitable slots provided in said slide, see Fig. 14. A bracket 169 is fast to the slide 166 and has a stud 170 mounted therein. Another bracket 171 is fast to the frame 1 and has a stud 172 mounted therein. A connecting rod 173 extends between the stud 170 and the stud 172, being fast at one end in the stud 170 and being slidable within the stud 172. Nuts 17 4 and 17 5 have screw-threaded engagement with the connectingrod 173 and are located upon the opposite sides of the stud 172 and when it is desired to rock the slide 166 upon the bed plate 165 to vary the angular relation between the face of the grinding wheel l g and the work, the screws 168 are first loosened and the nuts 174 and 175 are rotated in the proper direction to move the slide 166 as required. A scale 176 .is fastened to the side of the slide 166 at one of the corners of said slide, said scalebeing curved and concentric with the pivot 167 and said scale is provided with graduations 177 which cooperate with an indicator 178 in indicatin the amount of movement imparted to sai slide. a

A carriage 179 is mounted to slide upon ways 180 and 181 formed upon the slide 166 and said carriage is moved relatively to said wheel relatively to the work which 1s necessary every time that the dimensions of the blanks are changed, or after the face of the grinding wheel has been ,redrcssed through the medium of a worm 182 fast to a shaft 183 journalled to rotate in a bearing 184 fast to the carriage 179. The worm 182 engages a plate 185 fast to the slide 166, said plate, in effect, constituting a stationary nut which is provided with teeth 186 with which the periphery of the worm 182 engages. The shaft 183 has a gear 187 fastenedthereto which meshes with and is rotated by a gear. 188 loosely mounted upon a stud 189 non-rotatrinding in dotted lines, Fig. 1 path into engagement with the work A. at which time it assumes the position illustrated ably mounted in the carriage 17 9. 'The gear 188 meshes with and is driven by a pinion 190 fast to a shaft 191 mounted to rotate in bearings 192 and 193 located within a tube 194, said tube .being clamped in arms 195 and 196 which project upwardly from the carriage 179. The shaft 191 is rotated through the medium of a hand wheel 197, and an index finger 198 is clamped to the tube 194 and registers with graduations 199 provided upon the periphery of the hand wheel 197.

Mounted upon the carriage 179 is a rocking member 200 which is provided withtrunnions 201 and 202 located in bearings 203 and 204 respectively formed upon said carriage. The bearings 203 and 204 also embody therein caps 205 and 206 respectively. Located with-v in the rocking member 200 and secured therein any suitable manner are split bearings 207 and 208 in which a shaft 209 is journalled to rotate, and fast to said shaft at one end thereof is a grinding wheel 210. The axis of the shaft 209 is eccentrically disposed relatively to the axis of the rocking member 200, see Fig. 17, and this particular construction and relationship between the axes of the shaft 209 and the-rocking member 200 constitutes one of the principal features of this invention. The shaft 209 is rotated through the medium of a pulley 211' fast there to which, in turn, is rotatedthrough the medium. ofa belt 212 which is driven through the medium of a pulley 213 fast to the main driving shaft 2, see Fig. 15. The belt 212 in passing from the driving pulley 213 extends over an idler pulley 214 mounted upon a shaft 215 mounted in a bracket 225 fast to the frame 1 and also over a take-u pulley 216 mounted upon a shaft 217, the latter being mounted in a lever 218 pivoted at 219 upon the bracket 225. The

ment with the belt 212 through the medium of a spring 220, one end of which is secured tov a bracket 221 attached to the frame 1, the other end of said spring being attached-to an adjustin screw 222 mounted in a block 223 fast to t e lever 218 and the tension upon the spring 220 is varied by manipulating an adjusting nut 224 which has screw-threaded en agement with the screw 222.

the carriage 1 210 from its normal position as represented through a curvilinear in full lines, Fig. 17 by mechanism as fol- 1ows:-Rigidly fastened to the outer end face of the trunnion 202 of the rocking member 200 is an arm 226, see Fig. 16, upon which a block 227 is mounted to swivel throu h the medium of a stud 228. The block 2 rojects into a grooved member 229 whic is adjustably mounted upon a screw-threaded end 230 of a vertically disposed rod 231,.the

he rocking7 member 200 is rocked within 9 to move the grindingwheel.

latter being mounted in a bearing bracket 232 fast at the end of the frame 1. Arecess 233 is provided at the lower end of the rod 231 and located within said recess is a member 234 which is normally forced upwardly against the end of the recess 233 through the medium of a spring 235, the opposite end of said spring contacting with the inner end of a screw plug 236. The outer end of the screw plug 236 rests upon an adjusting screw 237 mounted in the bracket 232. The rod 231 is raised and lowered through the medium of a lever 238 pivoted at 239 upon thebearing bracket 232 and said lever has an end portion 240 detachably secured thereto which projects into a slot 241 formed in the member 234. The opposite end of the lever 238 has a cam roll 242 mounted thereon which projects into a roove 243 of a cam 244 fast to the cam shai t 49.

The cam 244 imparts a rocking movement to the lever 238 which, in turn, transmits a reciprocatory motion to the rod 231, which, in turn, rocks the member 200 through the medium of the arm 226, thereby lifting the grinding wheel 210 from the dotted line position illustrated in Fig. 17 and the periphery of said grinding wheel travels upwardly in a curvilinear path, the radius of which is greater than the radius of the grinding wheel, until the axes of the work A, grinding wheel shaft 209 and "rocking member 200 are all located in the same plane also as illustrated in said Fig.- 17. At this time the curvilinear path through which the periphery of the grinding wheel has travelled is approximate.- y tangential to the periphery of the work at its point of contact with said work.

The roove 243 of the cam 244 is so constructe that the grinding wheel approaches the work quickly until it is approximately in enga ement therewith, after which said grin ing wheel is fed slowly during the grinding operation until it arrives at the limit of its upward movement which position is illustrated in Fig. 17, where it dwells for a short groun which the grinding wheel drops quickly to its initial POSltlOD,

The mechanism for imparting a reciproca tory movement to the grinding wheel longis tudinallyof its axis is as follows :-Referring particularly to Figs. 16, 17 and 18, a shaft 245 is journalled to rotate in bearings 246 and 247 formed in the carriage 179 and cap 206 and said shaft has a shouldered portion 248 formed integral therewith which is also eccentrically disposed relatively to the main portion of said shaft. A block 249 is loosely. mounted upon the eccentric portion 248, said block being located between ways 250 formed in the trunnion 202 of the rocking member 200, said ways being'in sliding engagement with said block. A clutch member 251 1:

period during which time the work is' to afine and accurate finish, after keyedto the shaft 245 and is also adapted to slide longitudinally thereon into engagement with a clutch member 252 which .is loosely mounted upon the shaft 245. A wormgear 253 is fast to a clutch member 252' and said worm gear is rotated through the medium of a worm 254 fast to a shaft 255'journalled to rotate in suitable bearings provided in the carriage 179. The shaft 255 is rotated through the medium of a pulley 256 which is fast thereto, said pulley being rotated through the medium of a belt 257 from a pulley 258 fast to the main driving shaft 2. I

The clutch member 251 is moved into and out of engagement with the clutch member 252 through the medium of a clutch shifting member 259 fast to a shaft 260 mounted in the carriage 179 and said shaft is rocked through the medium of an operating handle 261 fast to said shaft and located at a convenient position at one end of the machine.

A cover plate-262 is located above that portion of the rocking member 200 which is located between the caps 205 and 206, see

Figs 2 and 19, and a guard 263 is provided for the grinding wheel 210. The work A after it has been ground is released from between the head-stock and tail-stock mechanisms and drops into a suitable receptacle 264, the bottom of which slopes forwardly thereby enabling said work to slide or roll to a convenient location at the front of the machine from which position'it may be easily removed.

General operation Assuming that the machine is. in a position where a blank has just been ground and dropped into the receptacle 264 and the machine is ready to receive another unfinished blankin order that the same may be ground, the. operator starts the machine by moving the operating handle 136 in the proper direction-to throw the clutch member 129 into engagement with the clutch member 128, thereby.

causing the camshaft 49 to be rotated from the work driving shaft 9 through the medium of the earing illustrated in Figs. 7 and 8.

shaft 9 is rotating continuously, being driven from the main driving shaft and that the head-stock spindle 13 and chuck 19and tailstock spindle 71 and centering pin 74 are rotating continuously .in unison, being driven from the work driving shaft 9, while the grinding wheel 210 is rotating continuously, being driven from the main driving shaft 2. As soon as the cam shaft 49 commences to rotate, the cam 159 will operate the mechanism to move the lowermost blank Ain the magazine 137 forwardly into position between the head-stock and tail-stock mechanisms. The cam 93 will then operate the mechanism to move the tail-stock spindle 71 longitudinally causing the centering pin 74 i to engage the blank A and push the same into It will be understood that the work driving igo the chuck 19. The cam 48 will then operate the mechanism to cause the chuck it) to grip the blank A, whereupon said blank will immediately begin to rotate in unison with the head-stock and tail-stock spindles. The cam 159 will then return the work supports 142 to their initial position and allowing another blank to drop into the pocket formed by the projections 149 and latches 150.

During the time that the head-st ck and tail-stock mechanisms are gripping and centering the blank, the cam 2% is feeding the grinding wheel 210 quickly towards said blank, the said grinding wheel travelling in a curvilinear path as it approaches the blank. As soon as the grinding wheel engages the blank, the cam 244 is so designed that the feeding movement of the grinding wheel into the Work is very slow until the limit of this feeding operation is reached, the grinding wheel dwelling in this position for a period While the work is receiving its final grinding. During all this time the grinding wheel is reciprocating in a direction longitudinally of its axis, although this mechanism may be thrown out of operation if it is so desired through the medium of the operating handle 261. As soon as the grinding of the blank is completed and while the grinding wheel is withdrawing, the tail-stock sprindle 71 is withdrawn and the chuck 19 releases the blank which falls into the receptacle 2M located therebeneath.

After the grinding wheel has been returned to its initial position and the finished article ejected from the machine as described, the

operations hereinbefore set forth are repeated on another blank and thus the operation continues until the machine is stopped by the operator, either by shifting the operating handle 136, thereby preventing the rotation of the cam shaft 49, or operating the clutch lever 5 and preventing the rotation of the main driving shaft.

If the character of the work is such that it is necessary to adjust the grinding wheel 210 so that the face of said grinding wheel is located at an angle to the axis of the work, the same is accomplished by loosening the screws 168 which fasten the slide 166 to the frame 1 and manipulating the adjusting nuts 174 and 175 until the face of the grinding wheel is positioned as desired relatively to the work.

\Vhenever it is necessary to adjust the position of the grinding wheel laterally of the work which is necessary after the grinding wheel has been redressed, the same is accomplished by rotating the hand wheel 197, thereby moving the carriage 17S} upon which the grinding wheel is mounted, bodily toward the work.

It will be understood that in some classes of work a gripping chuck is not required, the work being driven in some cases by the headstock and tail-stock centers by friction alone,

and I do not wish to be understood as limiting my invention to any specific means for holding the work and rotating the same.

I claim:

1. A grinding machine comprising, in combination, a work member, means to support and rotate said work member, a grinding member, means to support and rotate said grinding member and means to cause one of said members to approach and engage the other of said members in a path approximate- 1y tangential to the point of contact of said grinding wheel. and work. I

Q. A grinding machine comprising, in combination, means to support and rotate work, means to feed said work to said supporting means, a grinding member, means to support and rotate said grinding member and means to cause said grindingmember to approach and engage said work in a path approximately tangential to the point of contact of said grinding member and work.

A grinding machine comprising, in combination, means to support and rotate work, means to feed said work to said sup porting means, a grinding member. means to support and rotate said grinding member, means to cause said grinding member to approach, engage and withdraw from said work in a path approximately tangential to the point of contact ofsaid grinding member and work and means to release said work from said supporting means.

4. A grinding machine comprising, in combination, means to support and rotate work. a magazine adapted to hold a plurality of work blanks, means to feed said work blanks one at a time from said magazine to said support-- ing means, a grinding member, means to support and rotate said grimling member, means to cause said grinding member to approach, engage and Withdraw from said work in a path approximately tangential to the point of contact of said grinding member and work and means to release said work from said supporting means.

5. A grinding machine comprising. in combinatiommeans to rotatably support work at the opposite ends thereof, means to feed said work to said supporting means. means including said supporting means to rotate said work, a rotary grinding member, ieans to cause said grinding member to approach. engage and withdraw from said work in a path approximately tangential to the point of contact of said grinding member and workand means to release said work from said supporting means.

6. A grinding machine comprising, in combination, means to grip work at one end thereof, means to center said work at the other end thereof, means to feed said work to said gripping means and centering means, means to 7. A grinding machine comprising, in combination, means to grip work at one end thereof, means to center said work at the other end thereof, means to feed said work to said gripping means and centering means, means to rotate said work, a rotary grinding member, means to position said grinding member so as to vary the angular relation between the face of said'grinding member and-said work and means to move said grinding member through a curvilinear path into and'out of engagement with said work. 7

8. A grinding machine comprising, in combi nation, means to grip work at one end thereof, means to center and support said work at the other end thereof, a magazine adapted to hold a plurality of work blanks, means to feed said work blanks one at a time to said gripping means and centering means, means to rotate said gripping means, means to ro-- tate said centering means, a rotary grinding member and means to cause said grinding member to approach, enga e andwithdraw from said work in a pat approximately tangential to the point of contact of said grinding member and work.

9. A grinding machine comprising, in combination a head-stock and a tail-stock adapted to support and rotate work, a magazine embodying therein a plurality of sup ports adapted to support a column of work blanks, means to actuate said supports to carry said work blanks one ata time from said column to said head-stock and tail-stock, a rotary grinding member and means to move said grinding member through a curvilinear path into engagement with a work blank held by said head-stock and tail-stock, said path being approximately tangential to the point of contactof said grinding member and work. 10. A grinding machine comprising, in

combination, a head-stock and a tail-stock adapted to support and rotate work, a magazine embodying therein a plurality of supports adapted to support a column of work blanks, a frame upon which said supports are mounted, means to rock said frame to carry said. work blanks one at a time from said column to said head-stock and tail-stock, a

- rotary grinding member and means to move said grinding member through a curvilinear path into engagement with said work blank held by said tail-stock and head-stock, said path being approximately tangentially to the point of contact of said grinding member and work. i

11. A grinding machine comprising, in combination, means to grip work at one end thereof, means to center and support said work at the other end thereof, a magazine adapted to hold'a pluralityof work blanks,

means to feed said work blanks one at a time K into alignment with said gripping means and centering means, means to move said centering means toward said gripping means whereby the work held by said feeding means may be inserted in said gripping means, means to rotate said gripping; means whereby a rotary motion may be imparted to said work,

a rotary grinding member and means to cause 1 said grinding member to approach, engage and withdraw from said work in a path approximately tangential to the point of contact of said grinding member and work.

12. A grinding machine comprising, in combination, means to grip work at one end thereof, means to center and support said work at the other end thereof, a magazine adapted to hold a plurality of work blanks, means to feed said work blanks one at a time into alignment with said gripping means and centering means, means tomove said centering means toward said gripping means whereby the work held by said feeding means may be inserted in said gripping means, means to rotate said gripping means whereby a r0- tary motion maybe imparted to said work, a rotary grinding member, means to position said grinding member so as to vary the angular relation between the face of said grinding member and said work and means to move into alignment with said gripping means and centering means, means to move said centering means toward said gripping means whereby the work held by said feeding means may be inserted in said gripping means, means to rotate said gripping means whereby a rotary motion may be imparted to said work, a rotary grinding member, means to position said grinding member so as to vary the angular relation between the face of said grinding member and said work, means to move said grinding member through a curvilinear path into and out of engagement with said work, said path beingapproximatcly tangential to the point of contact of said grinding member and work and means to impart a reciprocatory 'motion to said grinding member longitudinally of its axis.

14. A grinding machine comprising, in combination, means to grip work at one end thereof, means to center and support said work at the other end thereof, a magazine 

